CN107653397B - A kind of β-γ high Nb containing TiAl based alloy with excellent high deformability - Google Patents
A kind of β-γ high Nb containing TiAl based alloy with excellent high deformability Download PDFInfo
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Abstract
A kind of β-γ high Nb containing TiAl based alloy with excellent high deformability, belongs to metal material field.Alloy is made of Ti, Al, Nb, B, Y and β phase stable element (Mn, Cr, Mo, V), and wherein Al content is 40-44at%, and Nb content is 6-10at%, and B content 0.1-0.3at%, Y content is 0.1-0.3at%.The single additive amount of Mn and Cr is respectively that the single addition content of 0.5-3.0at%, Mo and V are respectively 0-2.0at%, total addition level 1.0-7.0at%, surplus Ti.The tissue of alloy is mainly by γ phase and β phase composition, α2The content of phase is less, is 2.0%~5.0%, and the tissue of casting alloy is the equiax crystal of fine uniform.The present invention has the advantages that being added to β phase stable element, β phase content is increased, improves high Nb containing TiAl based alloy high temperature deformation ability, makes the β-γ high Nb containing TiAl based alloy that there is excellent high temperature deformation ability.
Description
Technical field
The present invention provides a kind of β-γ high Nb containing TiAl based alloy with excellent high deformability, belongs to high temperature alloy
Technical field.
Background technique
High niobium γ-TiAl intermetallic compound is because the addition of high-melting-point refractory metal Nb element improves the fusing point of alloy
And ordering temperature, diffusion coefficient and stacking fault energy are reduced, the elevated temperature strength and inoxidizability of alloy are improved, and is also taken into account
The density of common gamma-TiAl alloy is small, crystal structure is simple and is easy to through the excellent of control microscopic structure improvement performance
Point, therefore be considered as the high temperature lightweight structural material of new generation that the following aerospace most has application potential.However due to high niobium
The lower temperature-room type plasticity of gamma-TiAl alloy and fracture toughness, keep its hot-working character poor, thus limit its practical application.
The microscopic structure for obtaining fine uniform is the key that improve gamma-TiAl alloy temperature-room type plasticity.
Currently, the method for improving gamma-TiAl alloy temperature-room type plasticity mainly has alloying, heat treatment and hot-working (such as: forging
Make, roll) etc..Wherein, it is heat-treated (Wu XH, Hu D.Microstructural refinement in cast TiAl
alloys by solid state transformations.Scripta Mater,2005；52:731.) it is to pass through decontamination chamber
Brittleness B in temperature tissue2Mutually improve the temperature-room type plasticity of alloy, but the heat treatment process time is long, and is easy to appear bright
Aobvious Phenomena of Grain Growth；Hot-working (Tetsui T, Shindo K, Kobayashi S, Takeyama M.A newly
developed hot worked TiAl alloy for blades and structural components.Scripta
Mater,2002；It 47:399.) can be effectively crushed coarse as-cast structure, improve its room-temperature mechanical property, but hot-working is wanted
Ask material that there is good high temperature deformation ability, and the heat that the coarse as-cast structure of common gamma-TiAl alloy is unfavorable for alloy adds
Work process.
Common gamma-TiAl alloy is mainly by γ+α2Phase composition, as-cast structure are generally coarse lamellar structure, at
Divide unevenly, macrosegregation, casting texture is strong, has seriously affected performance (the Chen Yuyong, Xiao of TiAl alloy
Shulong,Kong Fantao,Wang Xue.Microstructure and interface reaction of
investment casting TiAl alloys.Transactions of Nonferrous Metals Society of
China, 2006,16:1910.) and subsequent hot procedure.However, β-γ TiAl alloy is mainly by γ phase and β phase group
At, and α2The content of phase is considerably less, such alloy can solidify original group for obtaining fine uniform, not being segregated strongly by β
It knits, the temperature-room type plasticity of gamma-TiAl alloy can be effectively improved.In addition, β-γ TiAl alloy is only at high temperature using unordered β phase
Vertical slip system is more, resistance of deformation is small, is easy to the characteristics of plastic processing, has excellent hot-working character.As it can be seen that high niobium γ-
TiAl alloy carries out the β phase content in alloying increase alloy, to be effectively improved the hot-working energy of high Nb-containing γ-TiAl based alloy
Power, researching and developing has the β-γ high Nb containing TiAl based alloy of excellent high deformability very necessary.
Summary of the invention
It is an object of the invention to increase β phase content, improve the heat of high Nb containing TiAl based alloy by addition β phase stable element
Working ability reduces the resistance of deformation of high Nb containing TiAl based alloy, improves the high temperature deformation ability of high Nb containing TiAl based alloy.
A kind of β-γ high Nb containing TiAl based alloy with excellent high deformability, it is characterised in that Al in Nb-TiAl alloy
Content is 40-44at%, and Nb content is 6-10at%, and B content 0.1-0.3at%, Y content is 0.1-0.3at%, and β phase is steady
It is respectively 0-2.0at% that the single additive amount for determining element M n and Cr, which is respectively the single addition content of 0.5-3.0at%, Mo and V,
Total addition level is 1.0-7.0at%, surplus Ti.
Further, Mn/Cr ratio is 3:2 in high Nb containing TiAl based alloy.
Further, Mn=1.5at% in high Nb containing TiAl based alloy, Cr=1.0at%, the β phase amount in alloy reach
12.5%, and β phase is in the netted of fine uniform.
Further, for high Nb containing TiAl based alloy tissue of the present invention mainly by γ phase and β phase composition, γ phase content is 76-
90%, β phase content are 4.2%-20.5%, α2The content of phase is less, is 2.0%-5.0%, and the tissue of casting alloy is tiny
Uniform equiax crystal.
Low Al and high Nb collective effect promote alloy to be changed into β solidification mode by α solidification mode.
B content is 0.1-0.3at%, has refined the crystallite dimension of equiax crystal；
Y content is 0.1-0.3at%, improves the inoxidizability of alloy to 900 DEG C；
The single additive amount of β phase stable element Mn and Cr are respectively the single addition content point of 0.5-3.0at%, Mo and V
Not Wei 0-2.0at%, total addition level 1.0-7.0at%, and with the increase of β phase stable element additive amount, the not only number of β phase
Amount obviously increases 4.2%-20.5%, and β phase morphology netted is changed into coarse rodlike or dendroid, the two by tiny
Joint effect the high temperature hot deformation resistance of alloy, it may be assumed that when the quantity of β phase be 4.2%-12.5% when, β phase morphology is in tiny more
Netted, high temperature hot deformation resistance is improved with the increase of β phase amount；Conversely, when the quantity of β phase is 12.5%-20.5%, β phase
Pattern is in coarse rodlike or dendroid more, easily leads to local rheology, and high temperature hot deformation resistance is dropped with the increase of β phase amount
It is low.Four kinds of elements are followed successively by Mn > Cr > Mo > V to the hoisting power of alloy high temperature deformation, and as Mn:Cr=3:2, especially
It is to work as Mn=1.5at%, when Cr=1.0at%, the high temperature deformation ability of the alloy is best；
The chemical component of β-γ high Nb containing TiAl based alloy of the invention is Ti-Al-Nb-B-Y-X, and specific ingredient is shown in Table 1.
The as-cast structure of the alloy is by γ phase and β phase composition, α2The content of phase is less, and the tissue of casting alloy obtains tiny
Uniform equiax crystal, the increase of β phase content significantly reduces the resistance of deformation of high Nb containing TiAl based alloy in alloy, and then improves
The hot-working ability of alloy.
The chemical component (atomic percent, at%) of 1 β-γ high Nb containing TiAl based alloy of table
The present invention has the advantages that being added to β phase stable element, β phase content is increased, high Nb containing TiAl based alloy is improved
High temperature deformation ability makes the β-γ high Nb containing TiAl based alloy have excellent high temperature deformation ability.
Detailed description of the invention
Fig. 1 is β-γ high Nb containing TiAl based alloy: the XRD spectrum of Ti-44Al-8Nb-1.5Mn-0.2B-0.2Y (atomic fraction)
Line；
Fig. 2 is β-γ high Nb containing TiAl based alloy: the as cast condition group of Ti-44Al-8Nb-1.5Mn-0.2B-0.2Y (atomic fraction)
Knit back scattering photo；
Fig. 3 is β-γ high Nb containing TiAl based alloy: the compression of Ti-44Al-8Nb-1.5Mn-0.2B-0.2Y (atomic fraction) is true
Stress-true strain curve；
Fig. 4 is β-γ high Nb containing TiAl based alloy: Ti-44Al-8Nb-1.5Mn-1.0Cr-0.2B-0.2Y's (atomic fraction)
As-cast structure back scattering photo；
Fig. 5 is β-γ high Nb containing TiAl based alloy: Ti-44Al-8Nb-1.5Mn-1.0Cr-0.2B-0.2Y's (atomic fraction)
Compress true stress-true strain curve.
Specific embodiment
Embodiment 1: ingredient is the high Nb- of β-γ of Ti-44Al-8Nb-1.5Mn-0.2B-0.2Y (atomic percent, at%)
TiAl alloy.Raw material is titanium sponge, high-purity Al, Nb-Al intermediate alloy, Al-Ti-B intermediate alloy, high-purity yttrium are considered to be worth doing, high-purity Mn,
The purity of various raw material is as shown in table 2.Ingot casting (smelting parameter such as table is smelted into using vacuum non-consumable arc-melting furnace
Shown in 3), melt back 5 times, obtained ingredient is uniform, tissue is fine uniform equiax crystal, the β-with excellent high deformability
γ high Nb containing TiAl based alloy.Fig. 1 is the XRD spectral line of the alloy, finds the presence of β phase.The piece of the original structure (Fig. 2) of the alloy
Layer group it is tiny, ingredient is uniform, not strong segregation, hence it is evident that better than traditional high Nb containing TiAl based alloy original structure (perhaps just
Virtue, Xu Xiangjun, Lin Junpin, Zhang Yong, Wang Yanli, Lin Zhi, Chen Guoliang are heat-treated to Microstructure for As-Cast High Nb Containing TiAl Alloy
The influence aeronautical material journal of middle S- segregation, 2007,27 (3): the content of β phase (white contrast) 28.), and in original structure
In significantly more than traditional high Nb containing TiAl based alloy β phase content (Xu Zhengfang, Xu Xiangjun, Lin Junpin, Zhang Yong, Wang Yanli, Lin Zhi, it is old
Influence aeronautical material journal of the good heat treatment of state to S-Segregation of Microstructure for As-Cast High Nb Containing TiAl Alloy, 2007,27
(3):28.).Fig. 3 is the Φ 6mm × 8mm cylinder sample cut in ingot casting, with 5 DEG C/s heating on Gleeble1500 testing machine
To 1200 DEG C, heat preservation starts to compress after 3 minutes, compression true stress-true strain curve (the strain rate 0.001s of acquisition-1),
The compression that Ti-44Al-8Nb-0.2B-0.2Y tradition high Nb containing TiAl based alloy under the same terms is also listed to compare Fig. 3 is really answered
Power-true strain curve, hence it is evident that the high temperature hot deformation resistance of the visible β-γ high Nb containing TiAl based alloy is significantly lower than traditional high Nb-
The high temperature hot deformation resistance of TiAl alloy (Ti-44Al-8Nb-0.2B-0.2Y) has good deformability.
The purity (wt.%) of 2 raw material of table
3 non-consumable arc furnace smelting parameter of table
Embodiment 2: ingredient is the β-of Ti-44Al-8Nb-1.5Mn-1.0Cr-0.2B-0.2Y (atomic percent, at%)
γ high Nb containing TiAl based alloy.Raw material is titanium sponge, high-purity Al, Nb-Al intermediate alloy, Al-Ti-B intermediate alloy, high-purity yttrium are considered to be worth doing,
High-purity manganese and High Pure Chromium (99.99wt%), in addition to High Pure Chromium raw material, the purity of various other raw material is as shown in table 2, uses
Vacuum non-consumable arc-melting furnace is smelted into ingot casting (smelting parameter is as shown in table 3), and melt back 5 times, it is equal that ingredient is made
Even, tissue is fine uniform equiax crystal, the β-γ high Nb containing TiAl based alloy with excellent high deformability.The original casting of the alloy
State tissue is the equiax crystal of fine uniform, and containing a large amount of β phase, lamella group is tiny, and ingredient is uniform, not strong segregation (figure
4).Fig. 5 is the Φ 6mm × 8mm cylinder sample cut in ingot casting, is warming up to 1200 on Gleeble1500 testing machine with 5 DEG C/s
DEG C, heat preservation starts to compress after 3 minutes, compression true stress-true strain curve (the strain rate 0.01s of acquisition-1), it is seen that the β-
The high temperature hot deformation resistance of γ high Nb containing TiAl based alloy is significantly lower than traditional high Nb containing TiAl based alloy (Ti-44Al-8Nb-0.2B-
High temperature hot deformation resistance 0.2Y) has excellent high temperature deformation ability and hot-working ability.
Embodiment 3: ingredient is the β-of Ti-44Al-8Nb-1.5Mn-1.0Cr-0.2B-0.2Y (atomic percent, at%)
γ high Nb containing TiAl based alloy.Raw material is titanium sponge, high-purity Al, Nb-Al intermediate alloy, Al-Ti-B intermediate alloy, high-purity yttrium are considered to be worth doing,
High-purity manganese and High Pure Chromium (99.99wt%), in addition to High Pure Chromium raw material, the purity of various other raw material is as shown in table 2, uses
Vacuum induction magnetic levitation melting pours the ingot casting for casting out Φ 50mm.Concrete technology includes device model: ZG-2XF, and vacuum degree is evacuated to 2
×10-2Pa carries out gas shield, in order to which melting is full and uniform, cloth hereinafter, being filled with high-purity argon gas in the forward direction vacuum chamber of melting
When refractory metal be placed on above, low-melting-point metal is placed on crucible bottom, and bottom puts titanium sponge in this experiment, centre put fine aluminium and
Other ingredients, upper layer place remaining titanium sponge.Melt back 3 times, it is cast to mold the 3rd time.To in ingot casting after melting
The pole for 6 × 8mm of Ф that portion is cut carries out structure observation and high temperature hot deformation resistance test, experimental result are as follows: original as-cast structure
For the equiax crystal of fine uniform, containing a large amount of β phase, lamella rolls into a ball tiny, not strong segregation；The high temperature deformation of the alloy is anti-
Power is significantly lower than the high temperature hot deformation resistance of traditional high Nb containing TiAl based alloy (Ti-44Al-8Nb-0.2B-0.2Y), has excellent
High temperature deformation ability and hot-working ability.
Claims (2)
1. a kind of β-γ high Nb containing TiAl based alloy with excellent high deformability, it is characterised in that have excellent high deformation
β-γ the high Nb containing TiAl based alloy of ability is to increase β phase content by adding β phase stable element to high Nb containing TiAl based alloy and be made；
The specific ingredient of high Nb containing TiAl based alloy is as follows:
Al content is 40-44at% in high Nb containing TiAl based alloy, and Nb content is 6-10at%, and B content 0.1-0.3at%, Y contain
Amount is 0.1-0.3at%, and the single additive amount of β phase stable element Mn and Cr are respectively that the single of 0.5-3.0at%, Mo and V adds
Adding content is respectively 0-2.0at%, total addition level 1.0-7.0at%, surplus Ti；
Mn/Cr ratio is 3:2 in high Nb containing TiAl based alloy；
For the tissue of high Nb containing TiAl based alloy mainly by γ phase and β phase composition, γ phase content is 76-90%, and β phase content is 4.2%-
12.5%, α2The content of phase is 2.0%-5.0%, and the tissue of casting alloy is the equiax crystal of fine uniform.
2. a kind of β-γ high Nb containing TiAl based alloy with excellent high deformability as described in claim 1, it is characterised in that high
Mn=1.5at% in Nb-TiAl alloy, Cr=1.0at%, the β phase amount in alloy reaches 12.5%, and β phase is in tiny
Even is netted.
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| CN108251693B (en) * | 2018-03-06 | 2020-09-22 | 中国航发北京航空材料研究院 | High-strength high-plasticity three-phase TiAl alloy and preparation method thereof |
| CN108787750B (en) * | 2018-05-24 | 2019-04-23 | 青岛理工大学 | An a kind of step large deformation milling method of β solidification TiAl alloy plate |
| CN110512116B (en) * | 2019-09-09 | 2021-03-26 | 中国航发北京航空材料研究院 | Multicomponent high-alloying high Nb-TiAl intermetallic compound |
| CN112322955A (en) * | 2020-11-20 | 2021-02-05 | 重庆理工大学 | Titanium-aluminum-based composite material with high-temperature service performance and preparation method thereof |
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